#include <REG52.H>
#include <stdio.h>

#ifdef MONITOR51
char code reserve [3] _at_ 0x23;
#endif

void main(void) { 
	#ifndef MONITOR51
		SCON = 0x50;
		TMOD |= 0x20;
		TH1 = 221;
		TR1 = 1;
		TI = 1;
	#endif
	
	while(1) {
		P1 ^= 0x01;
		printf("Hello World!\n");
	}
}